'''Commonwealth Edison''', commonly known as '''ComEd''', is the largest electric utility in Illinois
, serving the Chicago
and Northern Illinois area. The service territory roughly borders in Iroquois County, Illinois|Iroquois County
to the south, the Wisconsin
border to the north, the Iowa
border to the west, and the Indiana border to the east. The company's name is a portmanteau
of '''Com'''monwealth and Thomas
For more than 100 years, Commonwealth Edison has been the primary electric delivery services company for Northern Illinois. Today, ComEd is a unit of Chicago-based Exelon|Exelon Corporation
(NYSE: '''EXC'''), one of the nation's largest electric and gas utility holding companies. ComEd provides electric service to more than 3.8 million customers across Northern Illinois.
Commonwealth Edison's transmission lines operate at voltage
s of 69,000, 138,000, 345,000, and 765,000 volts, delivering power to...